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Webster 1913 Edition

Noun.

[L.

longus

long +

-metry

: cf. F.

longimétrie

The art or practice of measuring distances or lengths.

Cheyne.

Noun.

[L. longus, long, and Gr. measure.]

The art or practice of measuring distances or lengths, whether accessible or inaccessible.

longimetry ‎(uncountable)

The measurement of length.
(Can we find and add a quotation of Cheyne to this entry?)